Rotary flail type chipping head

ABSTRACT

A cylindrical body for concentric mounting on a driven rotary shaft and including peripherally spaced radial openings outwardly from which tine-type elongated members project. The tine members extend generally radially of the cylindrical body and are supported at their inner ends for lateral swinging of the outer ends of the tines in all directions to limit positions of deflection displaced approximately 10* relative to a radial disposition. Further, the radial innermost ends of the tines are supported from the cylindrical body member in a manner such that the tines will be biased, by centrifugal force, to radially extending positions upon rapid rotation of the body about its center axis.

United States Patent Talbert Aug. 28, 1973 [5 1 ROTARY FLAIL TYPECHIPPING HEAD 2,851,028 9/1958 Asbury 125/5 3,380,094 4/1968 Comstock...[761 Inventor: Tame", 102 3,193,908 7/1965 White 15/93 R Abilene, Kans.67410 [22] Filed: Dec. 16, 1971 Primary Examiner-Leon G. Machlin 1 J b 1pp No: 208,711 A: omey Harvey B aco son [57] ABSTRACT 52 U.S. c1. 15/236R, 29/81 1., 125/5 A cylindrical body for concentric mounting on adriven [51] Int. Cl. 344d 3/16 rotary shaft and including p ip y spacedradial {58] Field of Search 15/236 R, 93 R, 92, openings outwardly fromwhich timmype eiongated 9 81 81 members project. The tine members extendgenerally 81 125/3 114/222 144/115; 145/4 radially of the cylindricalbody and are supported at their inner ends for lateral swinging of theouter ends {56] References Cited of the tines in all directions to limitpositions of deflec- UNITED STATES PATENTS tion displaced approximately10 relative to a radial 2,952,066 9/1960 Pedersen 29 81 L dis osition.Furth the al nn rm t nds f th 1,153,738 9/1915 Van De Voorde l5/l04.l4tines are supported from the cylindrical body member 2,746,127 5/1956Jaques 29/81 J in a manner such that the tines will be biased, by cengtl 'l' 8 trifugal force, to radially extending positions upon u OUX1,829,531 10/1931 Neilsen 144/115 UX rapid of the body about center1,347,299 7/1920 Smith et a] 144/115 UX 8 Claims, 6 Drawing Figures /0/2 l4 f l .l 20 42 24 36 34 2 T 48 s-%--1 4 1 n/ lJj/l/I/ 1 44 26/ 13 32LI .U /6

.Patented Aug. 28, 1973 3,754,29fi

1 ROTARY FLAIL TYPE CHIPPI NG HEAD The chipping head of the instantinvention is designed to be utilized in many environments. It can beutilized to accomplish light peening operations, to cut carbon deposits,to rough finish epoxies of all types, to clean molds and to remove manyvarious types of surface coatings such as mineral deposits, paints andvarnishes, adhesives, etc. The chipping head is constructed in a mannerwhereby the tines thereof may be readily replaced so as to beparticularly adapted for a given cleaning or chipping operation. Ifrelatively hard materials are to be removed from hard surfaces,extremely hard tines may be utilized and tines constructed of softermaterials may be utilized to remove softer coatings or deposits fromless hard surfaces. Further, the chipping head is constructed in amanner whereby it may be used singly or in conjunction with one or moresimilar chipping heads.

The main object of this invention is to provide a rotary chipping headconstructed in a manner so as to be adaptable to many different chippingand surface coating removing operations.

Another object of this invention, in accordance with the immediatelypreceding object, is to provide a rotary chipping head including flailtype tines that may be readily removed and replaced by tines of othertypes.

Yet another object of this invention is to provide a rotary chippinghead that is particularly well adapted to be utilized either singly orin conjunction with one or more similar chipping heads.

A final object of this invention to be specifically enumerated herein isto provide a rotary flail type chipping head in accordance with thepreceding objects which will conform to conventional forms ofmanufacture, be of simple construction and easy to use so as to providea device that will be economically feasible, long lasting and relativelytrouble free in operation.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

FIG. 1 is a fragmentary perspective view of a conventional form ofmotorized grinder with a preferred form of the chipping head of theinstant invention mounted on the rotary output shaft of the grinder;

FIG. 2 is a fragmentary side elevational view of the grinder andchipping head illustrating one manner in which the chipping head may beutilized to remove surface scale or coatings;

FIG. 3 is a top plan view of the rotary chipping head with a portionthereof being broken away and illustrated in horizontal section;

FIG. 4 is an enlarged vertical sectional view taken substantially uponthe plane indicated by the section line 4-4 of FIG. 3 and illustratingthe manner in which the flail-type tines of the chipping head may belaterally deflected at their outer ends;

FIG. 5 is an exploded perspective view of the body portion of thechipping head; and

FIG. 6 is an enlarged fragmentary horizontal sectional view furtherillustrating the manner'in which the flail-type tine members may belaterally deflected.

Referring now more specifically to the drawings the numeral 10 generallydesignates a power grinder of the type including a rotary output shaft12 upon which a pair of annular abutments l4 and 16 are supportedagainst relative movement away from each other.

The rotary chipping head of the instant invention is referred in generalby the reference numeral 18 and is clampingly secured on the shaft 12between the abutments 14 and 16. The abutment 14 may be fixed stationaryrelative to the shaft 12 and the abutment 16 may be in the form of awasher secured on the shaft 12 by means of a nut 18 threadedly engagedwith the shaft 12.

The rotary chipping head 20 includes a generally cylindrical body 22.The body 22 comprises a first inner section 24 and a second outersection 26. The section 24 includes an end wall 28 including aperipheral cylindrical wall portion 30 and the section 26 includes anend wall 32 and a slightly larger diameter cylindrical peripheral wall34. The end walls 28 and 32 are provided with central apertures 36 and38 and the peripheral cylindrical wall 34 of the section 26 includesevenly circumferentially spaced radial bores 40.

It may be seen from FIG. 4 of the drawings that the sections 24 and 26may be secured on the shaft 12 between the abutments l4 and 16 with theshaft 12 snugly received through the apertures 38 and 36 in the sections24 and 26. It may also be seen that the end of the cylindricalperipheral wall 34 of the section 26 remote from the end wall 32 iscoplanar with the outer surface of the end wall 28 of the section 24when sections 24 and 26 are clamped between the abutments l4 and 16 onthe shaft 12. Further, it may also be seen that the peripheral wall 30of the section 24 has its outer surface spaced radially inwardly of theinner surface of the outer peripheral wall 34 of the section 26 therebydefining an annular space 42 between the peripheral walls 30 and 34.

The rotary chipping head 20 additionally includes a plurality of headedtines 44 including pointed ends 46 on their ends opposite from the heads48. The heads 48 are generally disc-shaped and circular in plan. Theheads are concentric with the center axes of the tines 44 and the tines44 are first inserted pointed end first through the bores 40 from theinner ends thereof until the heads 48 abut the inner surface of theperipheral wall 34 of the section 26. Thereafter, the section 24 istelescoped within the open end of the section 26 and held in positionuntil the head 20 is mounted on the shaft 12 between the abutments l4and 16.

It will be noted from FIGS. 4 and S of the drawings that the radialextent of the annular space 42 is greater than the axial thickness ofthe heads 48 and that the diameter of the bores 40 is slightly greaterthan the diameter of the tines44 adjacent the heads 48. Accordingly, thetines 44 may be angularly displaced 10 in all directions from positionsextending radially of the axes of the apertures 36 and 38.

It will be readily apparent that the tines 44 are shaped like headednails and it is pointed out that there are many different types of nailsthat may be advantageously used as the tines 44. Hardened masonry nailsmay be used as the tines 44 when the chipping head 20 is to be utilizedin removing heavy rust deposits, and cutting carbon deposits, etc.However, nails of softer materials may be utilized when the chippinghead 20 is to be utilized to remove softer coatings. Of course, the

many various types of nails which may be utilized as the tines 44 arepresently manufactured in extremely large quantities and may bepurchased inexpensively. Therefore, the chipping head 20 of the instantinvention, by its unique design enabling it to utilize various differenttypes of nails already commercially available, provides a rotarychipping head that may be inexpensively used in numerous environments.

From FIG. 2 of the drawings it may be seen that when the grinder ispositioned at an angle relative to the surface 50 to be acted upon bythe chipping head 20, the tines 44 in contact with the surface 50 willbe deflected and thus caused to sweep across the surface 50 infrictional engagement therewith in order to remove a coating on thesurface 50. Further, as hereinbefore set forth, if the grinder 10 isprovided with a shaft 12 of increased length, a plurality of heads maybe mounted on that shaft in size-by-side relation.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction andoperation shown anddescribed, and accordingly all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention.

What is claimed as new is as follows:

1. A rotary chipping head for mounting on'a rotary shaft between twoaxially spaced abutments on said shaft, said chipping head including agenerally regular body having an outer periphery and a central passageformed therethrough for receiving said shaft, a plurality of elongatedtines, each one of said tines being longer than the radius at saidregular body, said tines and body including means for supporting saidtines from peripherally spaced outer peripheral portions of said bodywith said tines disposed in a plane normal to the center axis of saidpassage and their radial innermost end portions universally supportedfrom said body for limited angular displacement of said tines in alldirections in and on both sides of said plane relative to positionsextending radially of said passage, said means including outer wallportions spaced about said periphery, disposed generally normal to radiiof said passage and having radial bores formed therethrough, said meansfurther including diametrically enlarged heads of greater diameter thansaid bores formed on the inner ends of said tines, said tines beingloosely received through said bores with said heads abutting the innersurface portions of said wall portions disposed about said bores.

2. The combination of claim 1 wherein said tines are constructed ofrigid metal.

3. The combination of claim 1 wherein said peripherally spaced outerperipheral wall portions comprise spaced portions of an outercylindrical wall carried by said body, said body also including aremovable inner cylindrical wall spaced inwardly from said outercylindrical wall and defining an annular space extending about said bodyimmediately inwardly of said outer cylindrical wall, the heads of saidtines being disposed in said annular space.

4. The combination of claim 3 wherein said body includes a first endwall and said outer cylindrical wall is carried by said first end wall,said body including a second end wall axially spaced from said first endwall and from which said inner cylindrical wall is supported, said innercylindrical wall projecting laterally from said second end wall towardsaid first end wall and being loosely telescopingly received within theconfines of said outer'cylindrical wall.

5. The combination of claim 4 wherein the end of said inner cylindricalwall adjacent said first end wall abuts against the latter and the outersurface of the second end wall is generally coplanar with the end of theouter cylindrical wall remote from the first end wall.

6. The combination of claim 5 wherein each of said end walls is providedwith a central aperture defining the opposite ends of said axialpassage.

7. The combination of claim 1 wherein said tines comprise headed nails.

8. The combination of claim 3 wherein the diameter of said tines in theareas thereof extending through said bores, the diameter of said bores,the axial thickness of said heads and the radial thickness of saidannular space being such to allow abutment of opposite sidediametrically opposite portions of said heads with the inner and outercylindrical walls and axially spaced diametrically opposite portions ofsaid tines with the portions of said outer peripheral wall defining theinner and outer ends of said bores to limit angular displacement of saidtines.

1. A rotary chipping head for mounting on a rotary shaft between two axially spaced abutments on said shaft, said chipping head including a generally regular body having an outer periphery and a central passage formed therethrough for receiving said shaft, a plurality of elongated tines, each one of said tines being longer than the radius at said regular body, said tines and body including means for supporting said tines from peripherally spaced outer peripheral portions of said body with said tines disposed in a plane normal to the center axis of said passage and their radial innermost end portions universally supported from said body for limited angular displacement of said tines in all directions in and on both sides of said plane relative to positions extending radially of said passage, said means including outer wall portions spaced about said periphery, disposed generally normal to radii of said passage and having radial bores formed therethrough, said means further including diametrically enlarged heads of greater diameter than said bores formed on the inner ends of said tines, said tines being loosely received through said bores with said heads abutting the inner surface portions of said wall portions disposed about said bores.
 2. The combination of claim 1 wherein said tines are constructed of rigid metal.
 3. The combination of claim 1 wherein said peripherally spaced outer peripheral wall portions comprise spaced portions of an outer cylindrical wall carried by said body, said body also including a removable inner cylindrical wall spaced inwardly from said outer cylindrical wall and defining an annular space extending about said body immediately inwardly of said outer cylindrical wall, the heads of said tines being disposed in said annular space.
 4. The combination of claim 3 wherein said body includes a first end wall and said outer cylindrical wall is carried by said first end wall, said body including a second end wall axially spaced from said first end wall and from which said inner cylindrical wall is supported, said inner cylindrical wall projecting laterally from said second end wall toward said first end wall and being loosely telescopingly received within the confines of said outer cylindrical wall.
 5. The combination of claim 4 wherein the end of said inner cylindrical wall adjacent said first end wall abuts against the latter and the outer surface of the second end wall is generally coplanar with the end of the outer cylindrical wall remote from the first end wall.
 6. The combination of claim 5 wherein each of said end walls is provided with a central aperture defining the opposite ends of said axial passage.
 7. The combination of claim 1 wherein said tines comprise headed nails.
 8. The combination of claim 3 wherein the diameter of said tines in the areas thereof extending through said bores, the diameter of said bores, the axial thickness of said heads and the radial thickness of said annular space being such to allow abutment of opposite side diametrically opposite portions of said heads with the inner and outer cylindrical walls and axially spaced diametrically opposite portions of said tines with the portions of said outer peripheral wall defining the inner and outer ends of said bores to limit angular displacement of said tines. 